反应详情

温度

5 °C

At 20° C., 264.3 g (6.0 mol) of ethylene oxide are passed into a solution of 192.2 g (1.0 mol) of benzofuran-2,3-dione 3-(O-methyl-oxime) 2-oxime in 2 1 of water over a period of 85 minutes. The solution is cooled to 5° C. and 70 g (1.06 mol) of sodium hydroxide pellets are added, on which the temperature increases to 10° C. The mixture is stirred without further cooling for another 165 minutes and the precipitate that has formed is filtered off with suction, washed with 500 ml of ice-water a little at a time and dried at 40° C. in a vacuum drying cabinet. 143.0 g (61% of theory) of benzofuran-2,3-dione 2-[O-(2-hydroxy-ethyl)-oxime] 3-(O-methyl-oxime) are obtained as a mixture of two stereoisomers.

1. temperatureincreases to 10° C
2. temperaturewithout further cooling for another 165 minutes
3. customthe precipitate that has formed
4. filtrationis filtered off with suction
5. washwashed with 500 ml of ice-water a little at a time
6. customdried at 40° C. in a vacuum
7. customdrying cabinet